A novel STING variant triggers endothelial toxicity and SAVI disease
Ontology highlight
ABSTRACT:
ORGANISM(S): Homo sapiens
PROVIDER: GSE267837 | GEO | 2024/06/04
REPOSITORIES: GEO
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Project description:Constitutive activation of STING by gain-of-function mutations triggers manifestation of the systemic autoinflammatory disease STING-associated vasculopathy with onset in infancy (SAVI) in humans and in mice. Murine SAVI is characterized by T cell lymphopenia, severe inflammatory interstitial lung disease, neuroinflammation and neurodegeneration with only limited contribution of type I interferon signaling. Here, we show that pharmacologic inhibition of TNF signaling in SAVI mice improved T cell lymphopenia, but had no effect on interstitial lung disease. However, complete blocking of TNF receptor signaling by knocking out TNFR1 and TNFR2 in SAVI mice rescued both, loss of thymocytes as well as interstitial lung disease. Furthermore, chronic STING signaling in lung endothelial cells of diseased mice enhanced transcription of cytokines, chemokines and adhesions proteins resulting in increased transendothelial migration of neutrophils across the endothelial barrier that could be reverted by genetic inactivation of TNFR1 and 2. Thus, our results demonstrate a pivotal role of TNFR-signaling in the development of SAVI-associated lung disease and suggest this pathway as promising target to ameliorate human SAVI
2024-04-16 | GSE244062 | GEO
Project description:Pediatric patients with constitutively active mutations in the cytosolic dsDNA sensing adaptor STING develop an autoinflammatory syndrome known as STING Associated Vasculopathy with onset in Infancy (SAVI). SAVI patients have elevated interferon stimulated gene expression and suffer from interstitial lung disease (ILD) with lymphocyte predominate bronchus associated lymphoid tissue (BALT). Mice harboring SAVI mutations (STING V154M or VM) that recapitulate human disease also develop lymphocyte rich BALT formation. Ablation of either T or B lymphocytes prolongs survival of SAVI mice, but lung immune aggregates persist, indicating that T cells and B cells can independently be recruited as BALT. VM T cells produced IFNγ and IFNγR deficiency prolonged the survival of SAVI mice; however, T cell dependent recruitment of infiltrating myeloid cells to the lung was independent of IFNγ. Lethally irradiated VM recipients fully reconstituted with WT BM-derived cells still developed ILD, pointing to a critical role for VM-expressing radioresistant parenchymal and/or stromal cells in the recruitment and activation of pathogenic lymphocytes. We identified lung endothelial cells as radioresistant cells which express STING. Transcriptional analysis of VM endothelial cells revealed upregulation of chemokines, pro-inflammatory cytokines, and genes associated with antigen presentation. Together, our data show that VM-expressing radioresistant cells play a key role in the initiation of lung disease in VM mice and provide new insights for the treatment of SAVI patients, with implications for ILD associated with other connective tissue disorders.
2022-02-11 | GSE196342 | GEO
Project description:Gain-of-function mutations in STING1, that codes for the Stimulator of Interferon Gene (STING), result in a severe autoinflammatory disease termed STING-associated vasculopathy with onset in infancy (SAVI). Although elevated type I interferon (IFN) production is thought to be the leading cause of the symptoms observed in patients, STING can induce a set of pathways, and their role in the onset and severity of SAVI remains to be elucidated. To address this point, we compared a single-cell RNA sequencing (scRNA-seq) dataset of peripheral blood mononuclear cells (PBMCs) from SAVI patients to a dataset of healthy PBMCs treated with recombinant IFN-β. We revealed a loss of mucosal associated invariant T cells and CD56bright natural killer cells in SAVI patients, not replicated in IFN-β-treated PBMC. Patient T cells are in an activated state associated with senescence and apoptosis, dependent on type I IFNs. Inferring cell to cell communication, from scRNA-seq predicted monocytes as potential drivers of this T cell phenotype and was supported by plasma cytokines measurement, with high CCL3, CCL4 and IL-6. Furthermore, scRNA-seq clustering identified a patient-specific subset of monocytes, highly inflammatory and expressing a strong integrated stress response (ISR). It also pinpointed to a patient with lower ISR, allowing us to identify a secondary mutation in PERK, that was recently shown to be activated by STING to trigger the ISR. Finally, based on the identification of this patient-specific subset of monocytes and the exploration of IFN-β stimulated PBMCs from healthy donors, we developed a strategy to propose a transcriptomic signature specific of STING activation and independent of type I IFN. Altogether, these results provide a deeper understanding of SAVI at the cellular and molecular levels.
2024-01-01 | GSE226598 | GEO
Project description:Gain-of-function mutations in STING1, that codes for the Stimulator of Interferon Gene (STING), result in a severe autoinflammatory disease termed STING-associated vasculopathy with onset in infancy (SAVI). Although elevated type I interferon (IFN) production is thought to be the leading cause of the symptoms observed in patients, STING can induce a set of pathways, and their role in the onset and severity of SAVI remains to be elucidated. To address this point, we compared a single-cell RNA sequencing (scRNA-seq) dataset of peripheral blood mononuclear cells (PBMCs) from SAVI patients to a dataset of healthy PBMCs treated with recombinant IFN-β. We revealed a loss of mucosal associated invariant T cells and CD56bright natural killer cells in SAVI patients, not replicated in IFN-β-treated PBMC. Patient T cells are in an activated state associated with senescence and apoptosis, dependent on type I IFNs. Inferring cell to cell communication, from scRNA-seq predicted monocytes as potential drivers of this T cell phenotype and was supported by plasma cytokines measurement, with high CCL3, CCL4 and IL-6. Furthermore, scRNA-seq clustering identified a patient-specific subset of monocytes, highly inflammatory and expressing a strong integrated stress response (ISR). It also pinpointed to a patient with lower ISR, allowing us to identify a secondary mutation in PERK, that was recently shown to be activated by STING to trigger the ISR. Finally, based on the identification of this patient-specific subset of monocytes and the exploration of IFN-β stimulated PBMCs from healthy donors, we developed a strategy to propose a transcriptomic signature specific of STING activation and independent of type I IFN. Altogether, these results provide a deeper understanding of SAVI at the cellular and molecular levels.
2024-01-01 | GSE226572 | GEO
Project description:A novel STING variant triggers endothelial toxicity and SAVI disease
| PRJNA1113342 | ENA
Project description:Stimulator of interferon genes (STING) is a central component of the pathway sensing the presence of cytosolic nucleic acids, having a key role in type I interferon innate immune response. Localized at the endoplasmic reticulum (ER), STING becomes activated by cGAMP, which is generated by the intracellular DNA sensor cyclic GMP-AMP synthase (cGAS). Due to its critical role in physiological function and its’ involvement in a variety of diseases, STING has been a notable focus for drug discovery. Recent advances in drug discovery allow the targeting of proteins previously considered “un-druggable” by novel mechanism of actions. Molecular glue degraders are defined as the compounds leading targeted protein degradation (TPD) by creating novel ligase-substrate interactions. Here, we identified AK59 as a novel molecular glue degrader for STING. A genome-wide, CRISPR/Cas9 knockout screen showed that the compound-mediated degradation of STING by AK59 is compromised by the loss of HECT and RLD domain containing E3 ubiquitin protein ligase 4 (HERC4), ubiquitin-like modifier activating enzyme 5 (UBA5) and ubiquitin like modifier activating enzyme 6 (UBA6). While UBA5 and UBA6 could be the auxiliary factors for AK59 activity, our results indicate that HERC4 is the main E3 ligase for the observed degradation mechanism. Validation by individual CRISPR knockouts, co-immunoprecipitations, as well as proximity mediated reporter assays suggested that AK59 functions as a glue degrader by forming a novel interaction between STING and HERC4. Furthermore, our data reveals that AK59 was effective on the most common pathological STING mutations that cause STING-associated vasculopathy with onset in infancy (SAVI), suggesting a potential clinical application of this mechanism. Thus, these findings not only reveal a novel mechanism for compound-induced degradation of STING but also utilize HERC4 as potential E3 ligase that for TPD, enabling novel therapeutic applications.
2023-06-22 | PXD040291 | Pride
Project description:Activation of the STING (Stimulator of Interferon Genes) pathway by microbial or self-DNA, as well as cyclic di nucleotides (CDN), results in the induction of numerous genes that suppress pathogen replication and facilitate adaptive immunity. However, sustained gene transcription is rigidly prevented to avoid lethal STING-dependent pro-inflammatory disease by mechanisms that remain unknown. We demonstrate here that after autophagy-dependent STING delivery of TBK1 (TANK-binding kinase 1) to endosomal/lysosomal compartments and activation of transcription factors IRF3 (interferon regulatory factors 3) and NF-κB (nuclear factor kappa beta), that STING is subsequently phosphorylated by serine/threonine UNC-51-like kinase (ULK1/ATG1) and IRF3 function is suppressed. ULK1 activation occurred following disassociation from its repressor adenine monophosphate activated protein kinase (AMPK), and was elicited by CDN’S generated by the cGAMP synthase, cGAS. Thus, while CDN’s may initially facilitate STING function, they subsequently trigger negative-feedback control of STING activity, thus preventing the persistent transcription of innate immune genes. Total RNA obtained from primary STING deficient mouse embryonic fibroblast reconstituted with mSTING (W), S365A variant (A), or S365D variant (D). These cells were transfected with dsDNA (ISD) for 3 hours.
2013-10-10 | E-GEOD-51199 | biostudies-arrayexpress
Project description:Patients afflicted with STING gain-of-function mutations frequently present with debilitating interstitial lung disease (ILD) that is recapitulated in mice expressing the STINGV154M mutation (VM). Prior radiation chimera studies revealed an unexpected and critical role for non-hematopoietic cells in initiating ILD. To identify STING-expressing non-hematopoietic cell types required for the development of ILD, we generated a conditional knock-in (CKI) model and directed expression of the VM allele to hematopoietic cells, fibroblasts, epithelial cells, or endothelial cells. Only endothelial cell-targeted VM expression resulted in enhanced recruitment of immune cells to the lung associated with chemokine expression and the formation of bronchus-associated lymphoid tissue, as seen in the parental VM strain. These findings reveal the importance of endothelial cells as instigators of STING-driven lung disease and suggest that therapeutic targeting of STING inhibitors to endothelial cells could potentially mitigate inflammation in the lungs of SAVI patients or patients afflicted with other ILD-related disorders.
2024-05-29 | GSE260893 | GEO
Project description:The pathogenesis of rheumatoid arthritis (RA) is complicated and involves both innate and adaptive immunity [5]. The innate immunity such as macrophages or fibroblast-like synoviocytes (FLS) in the synovium can generate inflammatory mediators, including TNF-α, IL-1, IL-6, IL-17, IFN-γ, and chemo kines that lead to synovial inflammation, bone erosion, and cartilage damage [6-8]. The IL-17 signaling mediates the autoantibody production in collagen-induced arthritis (CIA) model [9]. However, the treatment response with an anti-IL17 monoclonal antibody in RA patients shows a high degree of heterogeneity [10]. The inhibitors of the Janus kinase (JAK) pathway are approved for RA patients [11]. These data suggest that the targeted multiple cytokines through the JAK pathway are useful for RA treatment. Disturbance of type I IFNs (IFNs-I) signaling and production drive autoimmune development [12]. The presymptomatic RA patients display an increase of IFNs-I before the onset of symptoms [13]. The RA patients also show the elevation of IFN- α in the synovial fluid and high expression of IFNs-I regulated gene in peripheral blood mononuclear cells (PBMC) [14]. However, the role of IFNs-I in arthritis and bone homeostasis has suggested the accelerating effect of arthritis and bone damage. The interferon-alpha receptor knockout mice develop arthritis severity higher than wild-type mice in the model of antigen-induced arthritis [15]. IFNs-I also affects the bone homeostasis by inhibiting osteoclastogenesis via receptor activator of nuclear factor-kappa B (RANK) pathway, and reduction of c-FOS expression [16-18]. Therefore, the goal of RA treatment with antagonizing the IFNs-I pathway has to be optimized between efficacy and potentially adverse effect. STING is a cytosolic DNA sensor that initiates the production of IFNs-I. STING functions have been reported as both pro-inflammatory signaling and negative regulator against inflammation [19-21]. The mutation in exon 5 of the STING gene results in gain function leading to initiate inflammation and cause the Sting associated vasculopathy with onset in infancy (SAVI) [22]. Loss of STING function rescues DNaseII-deficient mice from lethality and polyarthritis [23]. However, Sting-deficient lupus mice (MRL/Lpr mice) show higher and earlier mortality than Sting-sufficient MRL/Lpr mice [24]. The pathology also shows lymphoid hypertrophy with a higher amount of macrophages and granulocytes infiltration, autoantibodies, and cytokine [24]. The objective of this study was to identify the role of STING in the pathogenesis of rheumatoid arthritis using collagen-induced arthritis (CIA) model as a representative model of the human RA.
2020-06-26 | PXD018652 | Pride
Project description:Stimulator of Interferon Genes (STING) is a key mediator of type-I interferon (IFN-I) signaling in response to a variety of stimuli, but the contribution of STING to homeostatic processes is not fully characterized. Previous studies showed ligand activation of STING limits osteoclast differentiation in vitro through the induction of IFN and IFN-I Interferon Stimulated Genes (ISGs). In a disease model (SAVI) driven by the V154M gain-of-function mutation in STING, fewer osteoclasts form from SAVI precursors in response to RANKL in an IFN-I-dependent manner. Due to the described role of STING-mediated regulation of osteoclastogenesis in activation settings, we sought to determine whether basal STING signaling contributes to bone homeostasis, an unexplored area. Using whole-body and myeloid-specific deficiency, we show that STING signaling prevents trabecular bone loss in mice over time and that myeloid-restricted STING activity is sufficient for this effect. STING-deficient osteoclast precursors differentiate with greater efficiency than wildtypes. RNA sequencing of wildtype and STING-deficient osteoclast precursor cells and differentiating osteoclasts reveals novel clusters of ISGs including a previously undescribed ISG set expressed in RANKL naïve precursors (tonic expression) and downregulated during differentiation. We identify a 50 gene tonic ISG signature that is STING-dependent and shapes osteoclast differentiation. From this list, we identify Interferon Stimulated Gene 15 (ISG15) as a tonic STING-regulated ISG that limits osteoclast formation. Thus, STING is an important upstream regulator of tonic IFN-I signatures shaping the commitment to osteoclast fates, providing evidence for a nuanced and novel role for this pathway in bone homeostasis.
2023-04-19 | GSE226625 | GEO